PC Games Need control instruction for game Alias(PC)


I have got and installed a copy of Alias(PC). Then I got a problem at the first stage(Casino).

1.After talking to the head waitress, I got Sydney standing close to the Blood Mary.
2.When the head waitress went away and turned her face to the wall, I got the item-menue by left arrwo key.
3.Then I focused "Tracer Serum" by down arrow key.
4.And here I got the problem. I had tried the action key(B by default) before the head waitress truned he face back, but nothing happened.

I'd like to know how to:
1.Dump Tracer Serum into Blood Mary.
2.Pick up the tray with Blood Mary.

Finally, send best Mid-Autumn-Day wishes from China.